Canadian Plastics

ABS up to tight tolerance requirements

Canadian Plastics   



Current trends towards very tight and zero-gap tolerances between components in automotive exterior applications drove BMW to change the way it manufactures guide rails for the front and rear bumpers...

Current trends towards very tight and zero-gap tolerances between components in automotive exterior applications drove BMW to change the way it manufactures guide rails for the front and rear bumpers of its 3 Series.

These stringent tolerance requirements put greater pressure on the guide rails, which attach the bumpers to the body of the car.

An ABS thermoplastic, dubbed Lustran H801, from LANXESS Corporation replaced glass fibre-reinforced polypropylene (PP). BMW already uses Lustran H801 for its 7 Series’ guide rails.

PP was used for its high stiffness and the low expansion co-efficient, but the material is prone to forming flashes, LANXESS said, which increased the risk of injuries to workers during assembly. Additionally, PP’s rough surface, propensity to warp and poor dimensional stability of the molded parts meant the guide rails were difficult and expensive to build — problems not associated with Lustran H801.

Advertisement

LANXESS predicts the ABS thermoplastic will be used more frequently for building guide rails especially since it is also suitable for pedestrian protection components.

LANXESS Corporation 800-LANXESS (526-9377)

Canadian Plastics june 2005

Advertisement

Stories continue below

Print this page

Related Stories